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Lab guide # 10

Lab guide # 10. C File Processing Review & Lab assignments. Key points. Data hierarchy File & Stream Create, read, write and update: Sequential access file Random access file. Bit, bytes, characters, records, files database. Data hierarchy. File:

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Lab guide # 10

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  1. Lab guide # 10 C File Processing Review & Lab assignments

  2. Key points • Data hierarchy • File & Stream • Create, read, write and update: • Sequential access file • Random access file

  3. Bit, bytes, characters, records, files database Data hierarchy

  4. File: • A sequence of bytes, ends with end-of-file marker • Structure • File descriptor • File control block • Stream: • Provide communication channel between files and programs • File pointer: to be returned when open a file • stdin, stdout, stderr • Read/Write function • fgets, fputc, fgets, fputs, fscanf, fprintf File & Stream

  5. Create FILE *cfPtr; cfPtr = fopen(“clients.dat", “w”); • Opening modes • Character mode: r,w,a,r+,w+,a+, • Binary mode: rb,wb,ab,rb+,wb+,ab+ Create, read, write and update

  6. Sequential vs. Random access file

  7. Fig. 11.8 Fig 11.12 Fig 11.15 Lab Assignment

  8. Hardware Store You are the owner of a hardware store and need to keep an inventory. 4. Lab Assignmentstion 11 Tool Record • The tool identification number should be the record number.

  9. Initialize the random-access file “hardware.dat” to 100 empty records. (ONLY if it was empty) • Menu • Input a tool data. • List all tools. • Delete a tool record. • Update a tool record. Program

  10. Use this information to start your file.

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